michael@0: // For-of passes one arg to "next".
michael@0: 
michael@0: load(libdir + 'iteration.js')
michael@0: 
michael@0: var log = '';
michael@0: 
michael@0: function Iter() {
michael@0:     function next() {
michael@0:         log += 'n';
michael@0:         assertEq(arguments.length, 1)
michael@0:         assertEq(arguments[0], undefined)
michael@0:         return { get value() { throw 42; }, done: true }
michael@0:     }
michael@0: 
michael@0:     this[std_iterator] = function () { return this; }
michael@0:     this.next = next;
michael@0: }
michael@0: 
michael@0: for (var x of new Iter())
michael@0:     throw 'not reached';
michael@0: 
michael@0: assertEq(log, 'n');